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The EU is an example of a trading bloc that has these kinds of rules. It's easy for both workers and employers to move across borders, but there are rules in place that require that standards be met. While it is imperfect, it's not the unfettered race to the bottom that NAFTA and CAFTA provide.
If "free trade" means that manufacturing jobs can move to where people are willing to work for less, that's one thing. If it means that the jobs can be moved to a place where agitating for a union gets you shot and toxic waste can just be tossed onto the street, it's another.